Madrid is about 2.3 times bigger than Saint Kitts and Nevis.

Saint Kitts and Nevis is approximately 261 sq km, while Madrid is approximately 604 sq km, making Madrid 132% larger than Saint Kitts and Nevis.
Tip: This to-scale comparison of Saint Kitts and Nevis vs. Madrid uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.